Air Inlet Damper Control Servo Motor Circuit - Air Conditioning System

AIR CONDITIONING: AIR CONDITIONING SYSTEM: 42: Air Inlet Damper Control Servo Motor Circuit

DTC 42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The blower damper servo sub-assembly (air inlet damper control servo motor) is controlled by the A/C amplifier and moves the air inlet damper to the desired position.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTUATOR CHECK
(a) Remove the glove compartment to see and check the recirculation damper operation.
(1) Operate the A/C control panel to enter the actuator check mode Actuator Check.
(2) Press the DEF switch to enter the step operation.
(3) Press the DEF switch in order, and visually check the recirculation damper operation.





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. INSPECT BLOWER DAMPER SERVO SUB-ASSEMBLY




(a) Remove the blower damper servo sub-assembly.




(b) Connect the battery positive (+) lead to terminal 4 and the battery negative (-) lead to terminal 5, then check that the lever turns to "RECIRCULATION" side smoothly.
(c) Connect the battery positive (+) lead to terminal 5 and the battery negative (-) lead to terminal 4, then check that the lever turns to "FRESH" side smoothly.
OK:
Motor operates smoothly.

NG -- REPLACE BLOWER DAMPER SERVO SUB-ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BLOWER DAMPER SERVO SUB-ASSEMBLY - A/C AMPLIFIER)
(a) Check for open and short circuit in the harness and the connector between the blower damper servo sub-assembly (air inlet damper control servo motor) and the A/C amplifier Electronic Circuit Inspection Procedure.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK DTC
(a) Start up the DTC check mode.
(b) Check that DTC 42 is not output again.
Result:





B -- SYSTEM IS OK
A -- REPLACE AIR CONDITIONING AMPLIFIER